Across
- 4. The force that keeps the planets in orbit around the sun.
- 8. An explosion that happens at the end of a massive stars' life.
- 9. A group of stars that makes a pattern in the night sky.
- 11. A terrestrial planet with no moons.
Down
- 1. Our sun is one of these.
- 2. A dwarf planet.
- 3. Closest planet to earth.
- 5. Someone who studies space and the universe.
- 6. A cloud of dust and gas in space.
- 7. Known as the red planet.
- 10. The planet we live on.